MIMO Testing Apparatus Using Linear Transform and Codebook
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing MIMO testing apparatuses require significant circuit resources and are costly, making it difficult to test M×N MIMO systems with a larger number of transmission antennas, and are challenging to modify from 2×2 to 4×2 MIMO schemes.
Innovation Solution
A testing apparatus that transforms M series signals into N synthesis signals using a linear transform unit with a matrix of N rows and M columns, incorporating signal processing units and N×N propagation channel processing to simulate M×N propagation channels, reducing the number of signal processing units and enabling easy adaptation to different antenna configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If M×N MIMO testing is performed using conventional methods with M signal processing units, then accurate propagation channel simulation is achieved, but circuit scale and cost increase significantly
Solution Approach 1:
The patent uses a codebook that stores pre-calculated precoding vectors and propagation channel characteristics. Instead of performing real-time complex signal processing for M transmission antennas, the system copies and applies pre-stored channel characteristics from the codebook to simulate M×N propagation channels, thereby reducing circuit complexity while maintaining simulation accuracy
Solution Approach 2:
The patent pre-calculates and stores propagation channel characteristics and precoding vectors in a codebook before actual testing. By performing these calculations in advance and storing them in memory, the system avoids the need for complex real-time computations during testing, thus reducing the required circuit scale while maintaining accuracy
2Adaptability or versatility
If the number of transmission antennas is increased from 2 to 4 in MIMO testing, then system capability is improved, but apparatus cost and complexity increase significantly
Solution Approach 1:
The patent designs a testing apparatus that can universally handle different MIMO configurations (2×2, 4×2, M×N) using the same N signal processing units. The codebook stores precoding vectors and channel characteristics for multiple antenna configurations, allowing the system to adapt to different MIMO schemes without requiring additional hardware, thus achieving multi-functionality with fixed resources
Solution Approach 2:
The patent changes the parameters stored in the codebook (precoding vectors, channel characteristics) to adapt to different MIMO configurations. By modifying the stored data parameters rather than the hardware structure, the system can test different antenna configurations (2×2, 4×2, M×N) using the same physical apparatus, thereby achieving adaptability without increasing complexity
3Adaptability or versatility
If existing 2×2 MIMO testing apparatus is modified to support 4×2 MIMO, then system versatility is improved, but modification difficulty increases
Solution Approach 1:
The patent implements a dynamic configuration system where the codebook can be loaded with different precoding vectors and channel characteristics corresponding to various MIMO configurations. The signal processing units can dynamically switch between different testing modes by loading appropriate parameter sets from the codebook, making the apparatus easily adaptable from 2×2 to 4×2 and M×N configurations without physical modification
Data Source
AI summary
Four (=M) transmission information signals are output from transmission information generating unit to linear transform unit, where they are transformed into synthesis signals by linear transform expressed by multiplication by a 2×4 matrix having complex numbers as elements. Signal processors perform signal processing corresponding to the modulation technique of test target on synthesis signals. On the resultant signals, 2×2 channel processing unit performs 2×2 pseudo channel processing, thereby forming equivalent M×N channels. Parameter setting unit sets information necessary to acquire desired M×N channel characteristics as the synthesis characteristics of linear transform unit and N×N channel processing unit.